package com.lagou.homework;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

public class HomeWorkMapper extends Mapper<LongWritable, Text, IntWritable, NullWritable> {
    //重写map方法，直接输出数字
    IntWritable num = new IntWritable();
    @Override
    protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
        num.set(Integer.parseInt(value.toString()));
        context.write(num,NullWritable.get());
    }
}
